Fix analyzer warning about mutable copies.
Fix analyzer warning about mutable copies.
nonoBruce/AFNetworking,AFNetworking/AFNetworking,opentable/AFNetworking,E-B-Smith/AFNetworking,FelixYin66/AFNetworking,Kjuly/AFNetworking,Kjuly/AFNetworking,nonoBruce/AFNetworking,AFNetworking/AFNetworking,Kjuly/AFNetworking,opentable/AFNetworking,opentable/AFNetworking,E-B-Smith/AFNetworking,E-B-Smith/AFNetworking,nonoBruce/AFNetworking,AFNetworking/AFNetworking,sunkehappy/AFNetworking